Quantum interference of electrons in a ring: tuning of the geometrical phase

Details Quantum interference of electrons in a ring: tuning of the geometrical phase Quantum interference of electrons in a ring: tuning of the geometrical phase

2005-05-11

arxiv.org/abs/cond-mat/0505273v3

Phys. Rev. Lett. 95, 226803 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, minor changes

Scientific paper

10.1103/PhysRevLett.95.226803

We calculate the oscillations of the DC conductance across a mesoscopic ring, simultaneously tuned by applied magnetic and electric fields orthogonal to the ring. The oscillations depend on the Aharonov-Bohm flux and of the spin-orbit coupling. They result from mixing of the dynamical phase, including the Zeeman spin splitting, and of geometric phases. By changing the applied fields, the geometric phase contribution to the conductance oscillations can be tuned from the adiabatic (Berry) to the nonadiabatic (Ahronov-Anandan) regime. To model a realistic device, we also include nonzero backscattering at the connection between ring and contacts, and a random phase for electron wavefunction, accounting for dephasing due to disorder.

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